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In commercial and industrial applications, several different filter designs are used. One, cartridge filters tend to be cylindrical in shape and are commonly used to remove sediment and other solids from liquids. Two, bag filters are used to remove larger particles from liquids. The liquids flow outward through the bag, so the solids are trapped inside. The bag can be made from a variety of materials. Three, hydraulic filters are used to purify petroleum-based liquids like oil and sometimes to purify fluids that contain water. These filters normally have a micron rating, which indicates the particle size filtered by the medium. Some manufacturers provide nominal ratings based on 50% filtration efficiency for the specified particle size and absolute ratings based on 98.7% efficiency.